Actions for Effective K. cap alpha. x-ray excitation rates for plasma impurity measurements

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Effective K. cap alpha. x-ray excitation rates for plasma impurity measurements

Author
Hill, K. W.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Bitter, M., Hiroe, S., Hulse, R., Ramsey, A. T., Sesnic, S., Shimada, M., Stratton, B. C., and von Goeler, S.

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Summary
Metal impurity concentrations are measured by the Pulse-Height-Analyzer (PHA) diagnostic from K..cap alpha.. x-ray peak intensities by use of an averaged excitation rate . Low-Z impurity concentrations are inferred from the continuum enhancement (relative to a pure plasma) minus the enhancement due to metals. Since the PHA does not resolve lines from different charge states, is a weighted sum of rates; coronal equilibrium is usually assumed. The used earlier omitted the intercombination and forbidden lines from the dominant helium-like state. The result was an overestimate of metals and an underestimate of low-Z impurities in cases where metals were significant. Improved values of using recent calculations for H-, He-, and Li-like Fe range from 10 to 50% larger than the earlier rates and yield metal concentrations in better agreement with those from VUV spectroscopy.
Report Numbers
DE86013631; PPPL-2348
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC02-76CH03073
OSTI Identifier 5405757
Research organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States).
View MARC record | catkey: 47366917